Evaluations for flow fields in a coastal reion with satellite-image analysis and numerical simulation

利用卫星图像分析和数值模拟评估沿海地区的流场

• 批准号: 13650573
• 负责人: NISHIMURA Tsukasa
• 金额: $ 2.11万
• 依托单位: Tokyo University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650573/
• 关键词: Oceanic turbulence; Satellite-image analysis; Numerical simulation; Coastal environment; Kuroshio; Nesting procedure; TOPEX; Poseidon; Seamark method; 衛生データ解析; 現地観測

Ocean currents such as the Kuroshio and Oyashio, which strongly influence on the flow fields around Japan-Island-China, are characterized by the mesoscale eddies with the representative horizontal length scale of a few hundreds kilometers. Although the behaviors of the mesoscale eddies are closely related with the coastal environments, there are a number of unknown factors for the dynamical evolution of the mesoscale eddies. On the other hand, the head investigator in this project has monitored the large-scale patterns of the water temperature and velocity vectors on sea surfaces with the image processing for the polar orbiting meteorological satellite NOAA, and then attempted to examine ocean current structures and the actual motion of mesoscale eddies around Japan-Island-Chain. For further evolutions of the above study, we here tried to develop an accurate tool to evaluate coastal currents with the satellite-image processing and numerical simulations. The main results of the project … More are expressed in the followings(1) Measurements for oceanic turbulence with the satellite-image analysisWe have conducted flow visualizations and sea-surface velocity measurements with NOAA/VHRR thermal infrared data. Every day the monitoring of the oceanic turbulence has been continuously performed by directly capturing the satellite data in our office. Combing the above satellite-based data and other published data concerning the oceanic turbulence, we have constructed the database for the oceanic turbulence around Japan-Island-Chain(2) Coastal current simulations with improved numerical modelsTo effectively incorporate offshore influences on coastal current simulations, a new one-waynesting procedure for coastal current model was developed and then applied to the coastal current simulation around an isolated island. Furthermore, we presented the two-way interactive nesting procedure to modify the above nesting model. We also attempted to improve the numerical accuracy of the 3D numerical models with special attentions to the hydrostatic approximation and sigma-coordinates Less

黑潮和亲潮等洋流对日本-岛屿-中国周围的流场影响较大，其特征是具有代表性的水平长度尺度为数百公里的中尺度涡流，尽管中尺度涡流的行为是复杂的。与沿海环境密切相关，中尺度涡流的动力学演化存在许多未知因素。另一方面，该项目的首席研究员监测了水温和速度的大尺度模式。利用极轨气象卫星 NOAA 的图像处理来研究海面矢量，然后尝试检查日本岛链周围的洋流结构和中尺度涡流的实际运动。开发一种通过卫星图像处理和数值模拟来评估海岸流的精确工具。该项目的主要结果如下：（1）通过卫星图像分析测量海洋湍流我们进行了流动。每天，我们办公室都会通过直接捕获卫星数据，结合上述基于卫星的数据和其他有关海洋湍流的数据，对海洋湍流进行可视化和海面速度测量。海洋湍流，我们构建了日本岛链周围海洋湍流的数据库（2）改进数值模型的沿岸流模拟为了有效地纳入近海对沿岸流模拟的影响，一种新的方法开发了沿海流模型的单向嵌套程序，并将其应用于孤岛周围的沿海流模拟。此外，我们还提出了双向交互式嵌套程序来修改上述嵌套模型，并尝试提高数值精度。 3D 数值模型，特别关注流体静力近似和西格玛坐标 Less

项目成果

西村司, 二瓶泰雄他6名: "日本列島周辺海洋乱流場の組織的渦構造"日本海洋学会春季大会講演要旨集. (発表予定). (2002)

Tsukasa Nishimura、Yasuo Nihei 等 6 人：“日本列岛周围海洋湍流场的组织涡流结构”日本海洋学会春季会议摘要（待提交）。

Yasuo Nihei, Yusuke Yamasaki, Tsukasa Nishimura et al.: "Proceedings of Coastal Engineering, JSCE, Vol. 49"Numerical accuracy of approximations in 3D numerical models for shallow-water flow fields,-sigma-coordinate system and hydrostatic approximation-. 4

Yasuo Nihei、Yusuke Yamasaki、Tsukasa Nishimura 等人：“海岸工程学报，JSCE，第 49 卷”浅水流场 3D 数值模型中近似值的数值精度，-sigma 坐标系和静水力近似值-。

佐藤, 二瓶, 西村他1名: "沿岸流動計算におけるネスティング手法の適用性に関する基礎的検討"日本海洋学会春季大会講演要旨集. 295 (2002)

Sato、Nihei、Nishimura 等人 1：“沿海流量计算中嵌套方法的适用性的基础研究”日本海洋学会春季会议记录 295 (2002)。

Yasuo Nihei, Yusuke Yamasaki, Tsukasa Nishimura et al.: "Proc. Of the 12th Int. Offshore and Polar Eng. Conf. Vol.2"Influence of hydrostatic approximation on coastal current simulation. 380-385 (2002)

Yasuo Nihei、Yusuke Yamasaki、Tsukasa Nishimura 等：“Proc. Of the 12th Int. Offshore and Polar Eng. Conf. Vol.2”静水近似对沿岸流模拟的影响。

Yasue Nihei, Yoshitaka Machida, Tsukasa Nishimura et al.: "Proceedings of Coastal Engineering, JSCE, Vol.49"A new two-way interactive nesting procedure. 421-425 (2002)

Yasue Nihei、Yoshitaka Machida、Tsukasa Nishimura 等人：“Proceedings of Coastal Engineering，JSCE，Vol.49”一种新的双向交互式嵌套程序。